Comparative evaluation of shear bond strength of brackets bonded with self-priming, colour changing, and a conventional orthodontic adhesive – An in vitro study

Background: Enhanced durability and bond strength between the bonding material and the enamel is essential for the clinical success of the orthodontic treatment. Bonding failures are inconvenient, delays treatment, costly and might compromise the outcome of the treatment. Hence this study was undertaken to evaluate and compare the shear bond strength of orthodontic brackets bonded with 3 different composites viz the Transbond-XT, Ormco Grengloo, and EZ-Bond. Methods: 36 freshly extracted maxillary premolars was collected and stored. Then specimen was randomly divided into the following groups and bonded accordingly with the adhesives planned for the study. 1 GROUP 1- Transbond XT with Transbond XT primer 2 GROUP 2- Grengloo with Ortho solo primer 3 GROUP 3- EZ bond adhesive Appropriately bonded samples were taken for shear bond test done using an Instron testing machine. Results: The mean SBS of Grengloo with Orthosolo primer, Transbond XT and EZ bond were 14.28 MPa, 13.99 MPa and 12.01 MPa respectively. There were no significant differences found in shear bond strength between Grengloo and Transbond XT but significant differences found in shear bond strength between Transbond XT and EZ bond adhesive as well as Grengloo and EZ bond adhesive. Conclusion: Metal brackets bonded with color changing adhesive Grengloo have shown superior shear bond strength. The color changing adhesives offer a viable alternative in cases demanding robust bond strength. Each presents unique advantages allowing the clinicians to select based on their preferences and specific requirements